Encoding::decode_to_utf16 ?

I’ve just written this function:

fn decode_to_utf16(bytes: &[u8], encoding: &'static Encoding) -> Vec<u16> {
    let mut decoder = encoding.new_decoder();
    let capacity = decoder.max_utf16_buffer_length(bytes.len()).exepct("Overflow");
    let mut utf16 = Vec::with_capacity(capacity);
    let uninitialized = unsafe {
        slice::from_raw_parts_mut(utf16.as_ptr(), capacity)
    };
    let last = true;
    let (_, read, written, _) = decoder.decode_to_utf16(bytes, uninitialized, last);
    assert!(read == bytes.len());
    unsafe {
        utf16.set_len(written)
    }
    utf16
}

Do you think it would belong as a method of Encoding?

Start with the issue's decode_to_utf16 function and the Encoding API, then inspect how similar decoding helpers are exposed in the project. Determine whether this belongs as an Encoding method or remains a standalone helper; the issue does not name files or tests that define completion.